Subjects: Biology >> Botany >> Applied botany submitted time 2018-10-26 Cooperative journals: 《广西植物》
Abstract： Dipterocarpus retusus Bl. is state’s key protected wild plant. It is the representative species in tropical rainforest of Southeast Asia. Our study aims to elucidate the community characteristics of Dipterocarpus retusus forest which has not yet studied before. Four community plots (30 m×30 m) and 20 population plots (10m×10m) were typically sampled in the Dipterocarpus retusus forest distributed in Niuluo River Natural reserve in Jiangcheng County. The height, DBH (diameter at breast height), numbers and community characteristic of all the spermatophyte species were recorded. We evaluated the distribution types, species diversity and population age structure. The results showed that: (1) 181spermatophyte species belonging to 143genera, 76 families were recorded. Dipterocarpus retusus community was dominated by tropical floristic elements, of which 58 families, 126genera and 162species were all belonging to tropical flora and the ratio were as high as 76.32%, 88.11% and 89.50%, respectively. (2) Species diversity indices are varied in different stand layers: Richness index and Shannon-Wiener diversity showed shrub layer＞tree layer＞herb layer, while Simpson index showed opposite trend shrub layer＜tree layer＜herb layer and Pielou index is similar in different stand. (3) Dipterocarpus retusus is the donimant species in the community with the highest important value of 26.85 in tree layer. (4) The age structure of Dipterocarpus retusus population had a positive pyramidal type which indicated that the populaiton structure is growing.
Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Plant Protection submitted time 2018-07-18 Cooperative journals: 《广西植物》
Abstract： Survey on plant resources plays a basic role in studying plant systematics and floristic evolutionary history and affinities, which is one of the important tasks of plant research in China. Although China has a rich accumulation in plant resources investigation with Flora of China and local flora records, data on plant resources in some remote areas are still lacking. Actinodaphne lecomtei Allen, Cinnamomum ilicioides A. Chev. and Carya kweichowensis Kuang A. M. Lu ex Chang et Lu are reported with new distribution records by morphological comparison in southern Yunnan, China, respectively. A. lecomtei was previously recorded to be found in Sichuan, Guizhou, Guangdong (Ruyuan) and Guangxi, China, C. ilicioides to be endemic to Guangdong, Hainan, Guangxi, China, and northern Vietnam, C. kweichowensis to be distributedinAnlong,Wangmo,Cenheng,Xingyi ofGuizhouetc., China.The newdistributionrecordsofA.lecomtei andC. ilicioides complements theweak areas in China, and provide a datafor analyzing relationshipbetween original species with genera and the taxonomic study of Lauraceae in China. The new distribution record of C. kweichowensis provides a new case at the species level for confirming the connection between C. kweichowensis and Annamocarya sinensis, furthermore, providesgermplasmresourcesforthedevelopmentofC.cathayensisproductioninYunnan.
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